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FAIR VALUE MEASUREMENTS AND INVESTMENTS - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2021
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Fair value measurements          
(Gain) loss on equity investments   $ (2,188) $ 1,775    
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders   1,530 4,220    
Privately Held Investment          
Fair value measurements          
Payments to acquire equity method investment   3,000 $ 2,800    
Ownership percentage     24.00%    
Carrying value   16,500     $ 11,000
Decrease in carrying value of equity method investment   600      
(Gain) loss on equity investments   400      
Currency losses   200      
Gain from conversion   2,500      
India solar operations          
Fair value measurements          
Payments to acquire equity method investment $ 1,200        
Carrying value   12,700      
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders $ 300        
Other Assets | Privately Held Investment          
Fair value measurements          
Carrying value   17,300     17,900
Other investments          
Fair value measurements          
Other investments measured using level 3 inputs   11,200      
Transferring out of level 3   11,000      
Fair value of the remaining level 3 investments   200      
Cash distributions   300      
Income recognized   100      
Other investments | Renewable energy partnership          
Fair value measurements          
Investment Tax Credit       $ 12,000  
Equity investments   2,100     2,300
Investment cost       $ 14,400  
Carrying Value          
Fair value measurements          
Long-term debt   82,700     72,800
Carrying Value | Other Assets          
Fair value measurements          
Investments   1,300     1,300
Level 2 | Estimated Fair Value          
Fair value measurements          
Long-term debt   $ 83,100     $ 73,300